Insulator



FIG. 1 is a perspective view of my new design for an insulator;

FIG. 2 is a top plan view thereof, the bottom plan view beig identical;

FIG. 3 is a side view thereof, the opposite side view being identical; and,

FIG. 4 is an end view thereof, the opposite end view being identical. 

The ornamental design for the insulator, as shown and described. 